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Our Staff

Get to know our friendly Fitness Together® Personal Training Staff at Mansfield.

Stephen Gannon BS, NASM CPT, TRX
Stephen Gannon BS, NASM CPT, TRX

Stephen Gannon BS, NASM CPT, TRX

Manager/Personal Trainer

Hello! My name is Stephen Gannon I’m a NASM certified personal trainer and I’ve been here with Fitness Together Mansfield for about 3 years now. A little bit about myself I graduated Mansfield High School in 2011 and graduated from Worcester State University in 2015 with a bachelor’s degree in criminal justice and health and fitness.

I began my fitness journey in college where I was the captain of the track and field team. I loved running but lifting weights and nutrition was my real passion which I would later figure out in my junior year of college. Since graduating I have found my true passion which is bodybuilding. I’ve competed in 4 bodybuilding shows, 1 in 2017 and 3 in 2018. My biggest accomplishment so far is winning the novice overall as well as 2nd place in the open class at the OCB Northshore Natural. Bodybuilding takes so much hard work and discipline but it has made me a better trainer in the long run.  

I live and breathe fitness and nutrition 24/7. The face my clients make when they achieve their goals is like no other feeling. I don’t care if you’re my first or my last client of the day I will give you my 100 effort and energy every single time you walk through that door. I love my job. I love helping others live a better life. Come check us out!  Remember when you feel like quitting remember why you started!


Passionate about: “I love the sport of bodybuilding. I love pushing my body to the absolute limit it can go. Using the combination of strength training, cardio and diet you can achieve amazing results. In competition prep I’m extremely dedicated to hitting my macro nutrient intake as well as every single workout. In the off season I really enjoy living a balanced and enjoyable life!


Previous/Present Work Experiences: Personal Trainer/Assistant Manager at Corporate Wellness & Fitness, Group Fitness Instructor at Plant Fitness, Personal Training Counselor at LA Fitness


Passion about your work: “What wakes me up every single morning is knowing how I can change someone’s life every single day. Being a personal trainer is more than just giving someone a great workout. You really give everything you have to that individual to change their life. I love personal training and it’s something I can’t see myself ever leaving.


Certifications: National Academy of Sports Medicine (NASM CPT), TRX Suspension Training, Bodybuilding (NASM), Integrated Speed, Agility & Quickness Training (NASM), Integrated Resistance Training (NASM) , Cardiorespiratory Training for Sports Performance (NASM), Integrated Core Training (NASM) 



Katelyn Doherty BA, NASM-CPT
Katelyn Doherty BA, NASM-CPT

Katelyn Doherty BA, NASM-CPT

Fitness and Nutrition Coach

Graduate of Bridgewater State University, Katelyn has a Bachelor of Arts degree in Physical Education with a minor in exercise physiology. She is also a Certified Person Trainer through the National Academy of Sports Medicine (NASM CPT). Health and fitness is a major part of her life and she loves helping others achieve their personal health and fitness goals. In addition to being a full-time personal trainer, Katelyn is a competitive bodybuilder. She started competing over a year ago and has never looked back, “knowing I can push my body to the absolute limits to achieve my goals is a constant motivator,” she says, “anyone can do anything they set their mind to” and that’s what she hopes to show clients through their training sessions. She exudes positivity and confidence as she trains and clients can truly see how passionate she is about helping them reach their goals.


Passionate about: “I love bodybuilding and push my body to the absolute limits. Being consistent with my strength training, cardio and dietary requirements is essential to me. In my competition prep season I make sure to hit my target goals for the week on point, but during my improvement season I allow for more flexibility and try to live a more balanced lifestyle. I love being in both stages and know what I have to do during each stage to achieve my goals.”

Previous/Present Work Experience: Group Fitness Instructor at Planet Fitness, Group Exercise Instructor for Bootcamp at BSU, Youth Cheerleading Coach

Passion about your work: “I love having the ability to help others reach their goals. Being that one person that can hold other accountable for their actions in regards to health and fitness gives me a purpose in life. Knowing that I have the tools and knowledge to guide others in the right direction for them to live and balance, healthy and happy life is what makes me wake up with a smile on my face every morning. I love what I do and I love changing people’s lives when they may not have thought it was possible.”

Certifications: National Academy of Sports Medicine (NASM CPT)